|
| US4004304 | 15 déc. 1975 | 25 janv. 1977 | Webster Spring Co. Inc. | Box spring assembly |
| US4068330 | 20 févr. 1976 | 17 janv. 1978 | Spiller Spring Company | Woven spring unit |
| US4068331 | 19 mai 1976 | 17 janv. 1978 | The Gilbert & Bennett Mfg. Co. | Box spring grid and method of manufacture |
| US4101993 | 22 févr. 1977 | 25 juil. 1978 | Steadley Company, Inc. | Wire spring assembly and components |
| US4236262 | 31 janv. 1979 | 2 déc. 1980 | Spiller Spring Company | Support grid and spring unit for a box spring foundation unit |
| US4475658 | 14 mars 1979 | 9 oct. 1984 | Roberts Display Corporation | Spring-loaded merchandising device |
| US4535978 | 16 nov. 1981 | 20 août 1985 | Sealy, Incorporated | Coil spring and spring assembly |
| US5080329 | 14 mai 1990 | 14 janv. 1992 | Hoover Group, Inc. | Spring loaded locking system for box spring assemblies |
| US5414874 | 30 mars 1994 | 16 mai 1995 | The Ohio Mattress Company Licensing & Components Group | Attachment member for spring or spring-like element |
| US5435023 | 30 mars 1994 | 25 juil. 1995 | The Ohio Mattress Company Licensing and Components Group | Wire grid attachment member for cushions, seats, foundations and the like |
| US5924681 | 26 août 1997 | 20 juil. 1999 | L&P Property Management Company | Preloaded spring assembly |
| US6186483 | 4 mars 1999 | 13 févr. 2001 | L&P Property Management Company | Preloaded spring assembly |
